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// Copyright 2012 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "storage/browser/file_system/local_file_stream_reader.h"
#include <stdint.h>
#include <memory>
#include <utility>
#include "base/check_op.h"
#include "base/files/file_util.h"
#include "base/functional/bind.h"
#include "base/functional/callback.h"
#include "base/functional/callback_helpers.h"
#include "base/location.h"
#include "base/task/bind_post_task.h"
#include "base/task/sequenced_task_runner.h"
#include "base/task/task_runner.h"
#include "base/types/expected_macros.h"
#include "base/types/pass_key.h"
#include "components/file_access/scoped_file_access.h"
#include "components/file_access/scoped_file_access_delegate.h"
#include "net/base/file_stream.h"
#include "net/base/io_buffer.h"
#include "net/base/net_errors.h"
namespace storage {
namespace {
const int kOpenFlagsForRead =
base::File::FLAG_OPEN | base::File::FLAG_READ | base::File::FLAG_ASYNC;
base::FileErrorOr<base::File::Info> DoGetFileInfo(const base::FilePath& path) {
if (!base::PathExists(path))
return base::unexpected(base::File::FILE_ERROR_NOT_FOUND);
base::File::Info info;
bool success = base::GetFileInfo(path, &info);
if (!success)
return base::unexpected(base::File::FILE_ERROR_FAILED);
return info;
}
} // namespace
std::unique_ptr<FileStreamReader> FileStreamReader::CreateForLocalFile(
scoped_refptr<base::TaskRunner> task_runner,
const base::FilePath& file_path,
int64_t initial_offset,
const base::Time& expected_modification_time,
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
file_access) {
return std::make_unique<LocalFileStreamReader>(
std::move(task_runner), file_path, initial_offset,
expected_modification_time, base::PassKey<FileStreamReader>(),
std::move(file_access));
}
LocalFileStreamReader::~LocalFileStreamReader() = default;
int LocalFileStreamReader::Read(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback) {
DCHECK(!has_pending_open_);
if (stream_impl_)
return stream_impl_->Read(buf, buf_len, std::move(callback));
Open(base::BindOnce(&LocalFileStreamReader::DidOpenForRead,
weak_factory_.GetWeakPtr(), base::RetainedRef(buf),
buf_len, std::move(callback)));
return net::ERR_IO_PENDING;
}
int64_t LocalFileStreamReader::GetLength(
net::Int64CompletionOnceCallback callback) {
bool posted = task_runner_->PostTaskAndReplyWithResult(
FROM_HERE, base::BindOnce(&DoGetFileInfo, file_path_),
base::BindOnce(&LocalFileStreamReader::DidGetFileInfoForGetLength,
weak_factory_.GetWeakPtr(), std::move(callback)));
DCHECK(posted);
return net::ERR_IO_PENDING;
}
LocalFileStreamReader::LocalFileStreamReader(
scoped_refptr<base::TaskRunner> task_runner,
const base::FilePath& file_path,
int64_t initial_offset,
const base::Time& expected_modification_time,
base::PassKey<FileStreamReader> /*pass_key*/,
file_access::ScopedFileAccessDelegate::RequestFilesAccessIOCallback
file_access)
: task_runner_(std::move(task_runner)),
file_path_(file_path),
initial_offset_(initial_offset),
expected_modification_time_(expected_modification_time),
file_access_(std::move(file_access)) {}
void LocalFileStreamReader::Open(net::CompletionOnceCallback callback) {
DCHECK(!has_pending_open_);
DCHECK(!stream_impl_.get());
has_pending_open_ = true;
base::OnceCallback<void(file_access::ScopedFileAccess)> open_cb =
base::BindOnce(&LocalFileStreamReader::OnScopedFileAccessRequested,
weak_factory_.GetWeakPtr(), std::move(callback));
if (file_access_) {
file_access_.Run({file_path_}, std::move(open_cb));
return;
}
file_access::ScopedFileAccessDelegate::RequestDefaultFilesAccessIO(
{file_path_}, std::move(open_cb));
}
void LocalFileStreamReader::OnScopedFileAccessRequested(
net::CompletionOnceCallback callback,
file_access::ScopedFileAccess scoped_file_access) {
if (!scoped_file_access.is_allowed()) {
std::move(callback).Run(net::ERR_ACCESS_DENIED);
return;
}
int64_t verify_result = GetLength(base::BindOnce(
&LocalFileStreamReader::DidVerifyForOpen, weak_factory_.GetWeakPtr(),
std::move(callback), std::move(scoped_file_access)));
DCHECK_EQ(verify_result, net::ERR_IO_PENDING);
}
void LocalFileStreamReader::DidVerifyForOpen(
net::CompletionOnceCallback callback,
file_access::ScopedFileAccess scoped_file_access,
int64_t get_length_result) {
if (get_length_result < 0) {
std::move(callback).Run(static_cast<int>(get_length_result));
return;
}
stream_impl_ = std::make_unique<net::FileStream>(task_runner_);
callback_ = std::move(callback);
const int result = stream_impl_->Open(
file_path_, kOpenFlagsForRead,
base::BindOnce(&LocalFileStreamReader::DidOpenFileStream,
weak_factory_.GetWeakPtr(),
std::move(scoped_file_access)));
if (result != net::ERR_IO_PENDING)
std::move(callback_).Run(result);
}
void LocalFileStreamReader::DidOpenFileStream(
file_access::ScopedFileAccess /*scoped_file_access*/,
int result) {
if (result != net::OK) {
std::move(callback_).Run(result);
return;
}
// Avoid seek if possible since it fails on android for virtual content-uris.
if (initial_offset_ == 0) {
std::move(callback_).Run(net::OK);
return;
}
result = stream_impl_->Seek(
initial_offset_, base::BindOnce(&LocalFileStreamReader::DidSeekFileStream,
weak_factory_.GetWeakPtr()));
if (result != net::ERR_IO_PENDING) {
std::move(callback_).Run(result);
}
}
void LocalFileStreamReader::DidSeekFileStream(int64_t seek_result) {
if (seek_result < 0) {
std::move(callback_).Run(static_cast<int>(seek_result));
return;
}
if (seek_result != initial_offset_) {
std::move(callback_).Run(net::ERR_REQUEST_RANGE_NOT_SATISFIABLE);
return;
}
std::move(callback_).Run(net::OK);
}
void LocalFileStreamReader::DidOpenForRead(net::IOBuffer* buf,
int buf_len,
net::CompletionOnceCallback callback,
int open_result) {
DCHECK(has_pending_open_);
has_pending_open_ = false;
if (open_result != net::OK) {
stream_impl_.reset();
std::move(callback).Run(open_result);
return;
}
DCHECK(stream_impl_.get());
callback_ = std::move(callback);
const int read_result =
stream_impl_->Read(buf, buf_len,
base::BindOnce(&LocalFileStreamReader::OnRead,
weak_factory_.GetWeakPtr()));
if (read_result != net::ERR_IO_PENDING)
std::move(callback_).Run(read_result);
}
void LocalFileStreamReader::DidGetFileInfoForGetLength(
net::Int64CompletionOnceCallback callback,
base::FileErrorOr<base::File::Info> result) {
std::move(callback).Run([&]() -> int64_t {
ASSIGN_OR_RETURN(const auto& file_info, result, net::FileErrorToNetError);
if (file_info.is_directory) {
return net::ERR_FILE_NOT_FOUND;
}
if (!VerifySnapshotTime(expected_modification_time_, file_info)) {
return net::ERR_UPLOAD_FILE_CHANGED;
}
return file_info.size;
}());
}
void LocalFileStreamReader::OnRead(int read_result) {
std::move(callback_).Run(read_result);
}
} // namespace storage
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